Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a811ea7320bb61…

MALICIOUS

PDF

92.9 KB Created: 2021-08-31 07:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e6475440594c7c05cb9c0297441778f SHA-1: f0bfb5d8cee0a38cb1f2d39735b34f171168f312 SHA-256: 20a811ea7320bb615ef28e8d57e0447ce6f14f50c69cc02ce2e4da502d0baa06
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users into clicking them, potentially leading to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier clean score 0.1927

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=bounce+2+student+book+pdf
    • http://aaaexpressheating.com/userfiles/file/23611193798.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qolfpd0r65qiod71rc1pgu2602/91071831823.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b80dc0a8e2d---fewogamageziminazenalo.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/54283318298.pdf
    • http://nappsa.org/userfiles/file/61579076730.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/pmn91k7miekk8n97tkfdbqjrhh/luzitufoxekusolukin.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa72b6f4b1---jajes.pdf
    • http://isdoor.ru/uploads/files/kurelesi.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ed5a33052---37214037245.pdf
    • http://fautographie.org/images/userfiles/files/16715306261.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c5719e9ec354d930f57d9e81e96ceacd/lerajo.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b58f0434603---bajivujugoderasusuwa.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/365b0e1147db4477f0bf3e6df84112b1/zozafufuxubijadukafejak.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/kimeveluxiwapitatux.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d640579e3b2---direduwixijajegizaw.pdf
    • http://uceng.net/_UploadFile/Images/file/91612083207.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbca7fd8e0e---kitinatulabas.pdf
    • http://perlawarmii.pl/userfiles/file/49997600673.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45863a3d9b---13880516773.pdf
    • http://imcborivali.org/userfiles/file/fakuka.pdf
    • http://1night2day.com/ckupload/files/90682539950.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161026529a5ab7---53126236130.pdf
    • https://infotechsystemsonline.com/ital/www/img/file/60526416902.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eaf02e6e8---17339349637.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161209efbecf99---66949912842.pdf
    • http://nomayaku.com/userfiles/file/lakulitonunesasefajolos.pdf
    • http://sswjeans.com/files/watakozotabowafeton.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/u2opoh1gs94o7j59cnn2mcsd5g/mexijopizijewitakurugaj.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115fa.bin
7c298248d20a30a1d9d2e39aaaecc857c30441b6afd0761f6fc05a560b597260
pdf-font-stream PDF embedded font (sfnt) at offset 0x115FA 20920 bytes
font_01_sfnt_off00014cb1.bin
ce54500a2d4f4364ca398c7c6edef5c09590e40571e884251545f189a373395c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB1 10720 bytes